I just found my way to this forum and found your post. I am hypothyroid as well. I don't know which diet is best but wanted to let you know that Atkins Phase 1 has helped me to lose 28.6 pounds in two months. I eat 5 small meals a day and I use a pedometer and add steps to my day wherever I can to boost my metabolism. I hope you find what works for you! Best wishes!